import java.util.Scanner;
public class Example2_3 {
  public static void main (String args []) {
  System.out.println("请输入若干个数，每输入一个数回车确认");
  System.out.println("最后输入数字0结束输入操作");
  Scanner reader = new Scanner(System.in);
  double sum = 0;
  double x = reader.nextDouble();
  while(x!=0) {
   sum = sum+x;
   x = reader.nextDouble();
      }
    System.out.println("sum="+sum);
   }
}
